Lowe Alpine Summit Attack 30 Hyperlite Backpack

I've had one of those for over 10 years now and it's great. I've have dragged it on all my backpacking and hiking trips over multiple countries and countless trips at home.

Since this bag is so simple, light and collapsible, it makes a great day bag to carry along in your expedition pack if you'll be doing day trips from a base camp.
The removable foam pad is nice to keep your bum warm during lunch breaks in the winter.

The waterproofing has now delaminated from mine but after 10 years of hard use it doesn't owe me anything. Probably will buy a new one.

The new one looks like it has padded shoulder straps (mine doesn't) which means it is probably more comfortable now but it may not fold as small as the one I have.

This is a comfortable, close-carrying pack for a day out climbing, hiking, etc. Light fabric to keep the weight down, good shaping for a close fit, clever attachments for ice tools or trekking poles. No crampon attachment; I added some stretch cord to the back using the sewn-in tabs, and this works just fine. The foam back pad is too small and too thin (my opinion) for a bivy pad, but does shape the back nicely and protects my back from getting jabbed by pointy things in the pack. Top liid is a little small. This fits with the overall streamlined lines of the pack, but I prefer more space for organizing stuff for ready access. Support is what you'd expect from a light frameless pack, but shoulder straps are nicely padded without getting bulky. I like it.

This pack is incredible, it's a perfect volume for trad, sport, ice (a little small maybe), BC ski, and groceries. The ice axe attachments are secure (better than BD's Speed 30) and it holds ski's fine A-frame style. Its light enough to be rolled up and tossed inside a larger pack for base camp style pursuits, and has none of the ridiculous bells and whistles most packs come with these days that you don't need anyway. Crampons attach fine with some cord, though be careful with the light material. If you think you need a bigger pack for any of the above activities, or one with more features, I challenge you to a duel bro...

Took this pack on a trip around a Patagonian Glacier. I was able to stash an extra dow jacket and a kilo bag, not to meantion my lunch and a liter of water. In the lid I was able to carry a liteweight first aid kit and a heatsheet. Great pack for chomping around the glacier, and then the weather rolled in. Big wind and cold rain, I was pretty worryed out my gear getting wet as we got soaked. When the weather passed and we got back to the boat I was pleased to find my gear still dry. While not touted as waterproof, this pack certainly kept the weather out.